Europhys. Lett.
Volume 75, Number 5, September 2006
Page(s) 804 - 810
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 02 August 2006
Europhys. Lett., 75 (5), pp. 804-810 (2006)
DOI: 10.1209/epl/i2006-10176-7

Anomalous Nernst effect in the vortex-liquid phase of high-temperature superconductors by layer decoupling

J. P. Rodriguez

Department of Physics and Astronomy, California State University Los Angeles, CA 90032, USA

received 5 June 2006; accepted 13 July 2007
published online 2 August 2006

Linear diamagnetism is predicted in the vortex-liquid phase of layered superconductors at temperatures just below the mean-field phase transition on the basis of a high-temperature analysis of the corresponding frustrated XY model. The diamagnetic susceptibility, and the Nernst signal by implication, is found to vanish with temperature as (Tc0 - T)3 in the vicinity of the mean-field transition at Tc0. Quantitative agreement with recent experimental observations of a diamagnetic signal in the vortex-liquid phase of high-temperature superconductors is obtained.

74.25.Dw - Superconductivity phase diagrams.
74.25.Ha - Magnetic properties.
74.25.Qt - Vortex lattices, flux pinning, flux creep.

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